Re: 2 Questions
Aftermarket chips usually say something on them like hypertech, atr, kenne bell, etc. stockers have 4 #'s and 4 letters like aybn 4175 is what my stock sy chip is. I ran my truck without the egr on it on the stock chip and never had a problem. My check engine light came on cruising down the highway but goes off after not cruising for a while.